Self-nanoscaling of the soft magnetic phase in bulk SmCo/Fe nanocomposite magnets

TitleSelf-nanoscaling of the soft magnetic phase in bulk SmCo/Fe nanocomposite magnets
Publication TypeJournal Article
Year of Publication2011
AuthorsRong CB, Zhang Y, Poudyal N, Szlufarska I, Hebert RJ, Kramer MJ, Liu JP
Journal TitleJournal of Materials Science
Volume46
Pages6065-6074
Date Published09
Type of ArticleArticle
ISBN Number0022-2461
Accession NumberWOS:000291951900019
Keywordsanisotropy, composites, deformation, energy product, GEOMETRY, instability, microstructure, multilayers, permanent-magnets, remanence enhancement
Abstract

Fabrication of bulk nanocomposite materials, which contain a magnetically hard phase and a magnetically soft phase with desired nanoscale morphology and composition distribution has proven to be challenging. Here we demonstrate that SmCo/Fe(Co) hard/soft nanocomposite materials can be produced by distributing the soft magnetic alpha-Fe(Co) phase particles homogenously in a hard magnetic SmCo phase matrix through a combination of high-energy ball milling and a warm compaction. Severe plastic deformation during the ball milling results in nanoscaling of the soft phase with size reduction from micrometers to similar to 15 nm. Up to 35% of the soft phase can be incorporated into the composites without coarsening. This process produces fully dense bulk isotropic nanocomposite materials with remarkable energy-product enhancement (up to 300%) owing to effective inter-phase exchange coupling.

DOI10.1007/s10853-011-5568-7
Alternate JournalJ. Mater. Sci.